With Christmas and the New Year’s hoopla now just a parting memory, there’s only one thing left to do for retailers across the country: count their dough.

Stores nationwide reported a 6.6 percent surge in same-store sales this December — resulting in the biggest holiday season in seven years.

November and December sales together rose 5.4 percent from the same time last year, said Bank of Tokyo-Mitsubishi Ltd., which tracks sales at stores open at least a year from about 80 retailers.

The increase for the holiday season tops 1999’s 5.1 percent gain and is the biggest since 1992’s 5.6 percent.

“Clearly, consumers were in a very good mood,” said Dorothy Lakner, a retail analyst at CIBC World Markets.

“The U.S. economy remains very strong, consumer confidence is very, very high — shoppers had money to burn,” she added.

Lakner said specialty retailers had a particularly explosive year — and continue to drive sales away from department stores. “Their fashion is on target and their customer service is much better than the big department stores.” She pointed to Tiffany & Co.’s 27 percent gain– its biggest since 1987 — as one specialty store whose sales went through the roof.

Still, other industry analysts said Tiffany’s wasn’t the only success story — strong numbers were reported across the board.